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Harrington, Steven; Zhu, Da‐Ming; Thirunavukkarasu, Arunachalam; Misra, Anil

doi:10.1023/a:1004507709744

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Lateral force images demonstrated more detailed changes in the surface morphology of the film surface as a result of weathering, as reported in this article. Detailed descriptions of AFM used for this study can be found in one of our previous articles 26…”

Section: Methodsmentioning

confidence: 99%

Deterioration of a polyurethane coating studied by positron annihilation spectroscopy: Correlation with surface properties

Huang

et al. 2001

J Polym Sci B Polym Phys

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Deterioration of a polyurethane coating by Florida natural environments as a function of time up to 16 weeks was studied by positron annihilation spectroscopy. Doppler broadening energy spectroscopy (DBES) of annihilation irradiation and positron annihilation lifetime (PAL) were measured as a function of incident positron energy (0 -30 keV). A significant decrease in the S-defect parameter from DBES and the intensity of orthopositronium from PAL was observed as a function of weathering time. This is interpreted as a loss of free volume and holes as a result of the weathering process. The gloss and surface morphology in the same system were measured by glossimetry and atomic force microscopy (AFM), respectively. The gloss decreased and surface roughness increased as a function of weathering time. The AFM images showed a new feature of a spherically coagulated microstructure on the surface after weathering. Direct correlations between the decrease in gloss and the increase in roughness as well as the decrease in the S-defect parameter from the DBES data and in the free volume from the PAL data were observed. These results were used to discuss the weathering process in terms of chemical and physical changes as a result of photodegradation in protective polymeric systems.

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Section: Methodsmentioning

confidence: 99%

Deterioration of a polyurethane coating studied by positron annihilation spectroscopy: Correlation with surface properties

Huang

et al. 2001

J Polym Sci B Polym Phys

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Physicochemical properties, surface morphology and particle size distribution of precipitated silicas

Żurawska¹,

Krysztafkiewicz²,

Jesionowski³

2003

Surface & Interface Analysis

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The results presented are from a study on the production of highly dispersed silicas by their precipitation from solutions of sodium metasilicate and ammonium salts. The applied ammonium salts were NH 4 HCO 3 and .NH 4 / 2 CO 3 . The precipitation process was conducted in the absence or presence of 1 wt.% non-ionic surfactant (Rokanol K-7, Rokafenol N-6 or Rokafenol N-9).The highly dispersed silicas obtained were subjected to a physicochemical analysis typical for fillers. The analysis included estimation of the bulk density and the capacities to absorb water, dibutyl phthalate and paraffin oil. Particle size and morphology were evaluated using scanning electron microscopy. In addition, particle size distribution for the precipitated silicas was examined by dynamic light scattering.Silicas with the best physicochemical properties were obtained by precipitation using ammonium hydrogen carbonate. In particular, the silica precipitated in the presence of 1 wt.% Rokafenol N-9 demonstrated a magnificent capacity to absorb paraffin oil.

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Improvement of corrosion resistance of spinel-bonded castables to converter slag

Mukhopadhyay¹,

Pal²,

Daspoddar³

2009

Ceramics International

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Untitled

Cited by 3 publications

References 17 publications

Deterioration of a polyurethane coating studied by positron annihilation spectroscopy: Correlation with surface properties

Deterioration of a polyurethane coating studied by positron annihilation spectroscopy: Correlation with surface properties

Physicochemical properties, surface morphology and particle size distribution of precipitated silicas

Improvement of corrosion resistance of spinel-bonded castables to converter slag

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